A Bona Fide Killer: It starts with an ordinary working mom who takes care of her kids by day and commutes to work, only to turn out to be the legendary sniper Kingfisher.
The people that Yoo Bo-na kills are criminals who received light sentences relative to the crimes they committed and were released without truly paying for their crimes.
Yoo Bo-na deliberately assassinates her targets in a loud, attention-grabbing way to draw the focus of the media and police, and while investigative attention is diverted, the other team members quietly dispose of other targets without a trace — that is their method.
Other criminals are killed anywhere from just after release up to as long as a year later, but they never let a child or sex offender live past 24 hours — killing them immediately, as guardians of justice in the dark.
Whenever the law fails to properly carry out judgment, Kingfisher (another persona of Yoo Bo-na) appears somewhere…
Table of Contents
A Bona Fide Killer Cast
Yoo Bo-na (played by Gong Hyo-jin): The protagonist of the drama. On the surface she is an ordinary department head in Sales Team 3 of “Durumi Electronics” and a five-year married woman, but in truth she is the legendary sniper “Kingfisher,” who dispatches irredeemable criminals the law has failed to punish with a single, unerring shot. She is both an ordinary homemaker devoted to housework and childcare, and simultaneously a cold-blooded assassin.
Kwon Tae-seong (played by Jung Jun-won): Yoo Bo-na’s husband and a social affairs reporter at the press outlet “Nat Today.” Without knowing his wife’s true identity, he is both a loving husband and a passionate reporter chasing the mysterious assassin “Kingfisher.”
Lee Dong-jin (played by Lee Sang-yi): The ace detective of Violent Crimes Team 2 at Seoul Southern Police Station. A man with a strong sense of justice, he has staked everything on defining “Kingfisher” as just another criminal and tracking down that identity.
Kim Bong-pal (played by Sung Dong-il): Team leader of Sales Team 3 at Durumi Electronics, and Yoo Bo-na’s workplace superior.
Bae Yun-ok (played by Seo Jung-yeon): The former team leader of Durumi Electronics Sales Team 3, now the owner of a flower shop.
Go Young-gap (played by Heo Jae-ho): A section chief in Durumi Electronics Sales Team 3, and a specialist in medical malpractice cases.
Bong Tae-min (played by Kim Nam-hee): A section chief in Durumi Electronics Sales Team 3, and a weapons specialist.
Gi Young-do (played by Moo Jin-seong): An assistant manager in Durumi Electronics Sales Team 3, and a genius hacker.
Oh Hyun-nam (played by Ha Yul-li): A new employee in Durumi Electronics Sales Team 3, and a poisoning specialist.
Yang Ye-sol (played by Kim Ga-hee): An assistant manager in Durumi Electronics Sales Team 3, in charge of administrative work.
Beom Seong-hoon (played by Choi Woo-sung): A detective on Violent Crimes Team 1 at Seoul Southern Police Station.
Gu Hae-na (played by Han Chae-rin): A new reporter at Nat Today and Kwon Tae-seong’s junior colleague.
Na Guk-jin (played by Choi Deok-moon): The bureau chief at Nat Today.
Ok Seon-ja (played by Cha Mi-kyung): Kwon Tae-seong’s mother, and owner of Tae-seong Chicken.
Kwon Se-a (played by Lee Eun-saem): Kwon Tae-seong’s youngest sister, a graduate student in physical education.
Kwon Sun-il (played by Lee Seon-hee): Kwon Tae-seong’s oldest sister.
Kwon Du-ri (played by Kim Yoon-jung): Kwon Tae-seong’s second-oldest sister.
Kwon Yul (played by Hwang Bom-i): The daughter of Yoo Bo-na and Kwon Tae-seong.
Seul-gi (played by Shin Hyun-soo): A killer who is a former Russian mercenary.
Original Webtoon “A Bona Fide Killer” Plot Summary
Until four years ago, Yoo Bo-na was known by the name Kingfisher, a legendary killer. The nickname comes from the kingfisher bird, which perches high up and darts like a bullet the moment it spots prey; at work, she was infamous as a perfectionist who was colder and more charismatic than anyone else.
But now, as Tae-seong’s wife and Yuri’s mother, she lives as an ordinary married woman fully devoted to housework and childcare. Time passes, and after finishing her childcare leave, she returns to work after four years at a company called Durumi Electronics…
On the surface it looks like an ordinary company, but Durumi Electronics is in fact a group of killers who dispatch vicious criminals the law has failed to catch. It is a gathering of people skilled in poisoning, hacking, sniping, and shooting, and from her very first day, team leader Kim Bong-pal apologetically orders her to go straight into a client meeting.
The place they go for the client meeting is, unexpectedly, the rooftop of a high-rise building, where they keep watch on the building across the way…
The “client meeting” is, in fact, the elimination of a target. This particular client was a monstrous man who had once disguised his wife’s death as an accident to collect insurance money, and who had been released after only a few years thanks to a reduced sentence on grounds of diminished capacity from drunk driving. Without a moment’s hesitation, Bo-na pulls the trigger and dispatches the target.
The death of the wife-murderer who had been released with a reduced sentence is reported widely in the news as the “revenge-motivated attack by a former colleague” case. The detective assigned to the case is Lee Dong-jin, Tae-seong’s close friend and an ace detective with one of the highest arrest rates on the force.
Because of a tragic incident in his school days, he understands the pain of victims better than anyone, but he believes only lawful judgment — not private retribution — is right, and he is convinced this is the work of Kingfisher and pursues the case. Dong-jin immediately senses that this crime bears the hallmark of Kingfisher, who vanished without a trace four years earlier, and he has a meal with his friend Tae-seong, the reporter who once covered Kingfisher exclusively, to plan their approach.
Dong-jin harbors doubts about Kingfisher’s four-year absence, and mentions that a mysterious white powder found on the rooftop across from the scene turned out to be baby powder. Hearing this, Tae-seong laughs it off, joking about a killer who uses baby powder.
Meanwhile, Bo-na, having finished her mission and returned home, finds happiness in the small, ordinary moments of daily life with her husband Tae-seong and daughter Yuri. Bo-na’s husband Kwon Tae-seong was once a reckless, passionate social affairs reporter dedicated exclusively to covering Kingfisher, but he abruptly stopped his reporting, puzzling his colleagues.
The next day, a new employee, Oh Hyun-nam, joins Sales Team 3 at Durumi Electronics…
Judging only by her name, everyone assumed she was a man, but she turns out to be a woman with sharp, piercing eyes who looks at Bo-na with a strange gaze. On the wall of Hyun-nam’s room are mapped-out articles and photos about Bo-na, along with a relationship chart of the main characters. Hyun-nam, a poisoning specialist who invented a toxic substance called Myst and had been working as a freelancer, joins the company two days after Bo-na returns to work, and from her very first day reveals a subtle jealousy…
At the office, Bo-na also gradually begins to take notice of Hyun-nam’s coldness toward her. While the team is gathered drinking coffee, Hyun-nam asks a strange question — whether Bo-na doesn’t miss the old days. When Bo-na replies that she’s happy now, with her family, Hyun-nam makes an inexplicably sad expression.
Her junior colleague Young-do grows suspicious of the fact that the family information on Hyun-nam’s résumé is left blank, and begins investigating her identity. Meanwhile, Hyun-nam contacts Tae-seong, saying she has a tip about a fraudulent pension-sale scam in a provincial city, and arranges to meet him. With a strange smile, Hyun-nam hands Tae-seong a suspicious cup of coffee, and just as he is about to drink it, a text arrives from Bo-na asking when he’ll be off work.
At last, Bo-na learns Hyun-nam’s true identity from Young-do and is shocked by what she discovers. The man Bo-na eliminated back in the winter of 2012, Oh Man-seok — who had just been released from Cheongju Prison and was heading home with a gift for his daughter — was in fact Hyun-nam’s father.
At that same moment, Tae-seong takes a sip of the coffee Hyun-nam gave him and collapses on the table. Looking down at him, Hyun-nam mutters to herself that Bo-na shouldn’t be the only one allowed to be happy. Bo-na receives a threatening text on her husband’s phone, along with a photo of the collapsed Tae-seong, demanding she come immediately, and she is thrown into shock.
Panicked, Bo-na rushes to Young-do and asks him to trace the location the text was sent from, then dashes to team leader Kim Bong-pal’s armory to grab equipment. With the help of the speed-obsessed Kim Bong-pal, she storms Hyun-nam’s hideout. Hyun-nam welcomes Bo-na, calmly telling her that she fed Tae-seong Myst, a poison that naturally breaks down before an autopsy can detect it once the person dies.
Enraged, Bo-na fires a shot that grazes Hyun-nam’s ear, but rather than being frightened, Hyun-nam smiles and tells her that unless she finds the antidote hidden in the broken cupboard behind her within 30 minutes, Tae-seong will die. If Bo-na kills her, she says, no one will be able to find the antidote — so who really has the advantage?
Realizing the situation, Bo-na immediately lowers her weapon and asks what Hyun-nam wants. Hyun-nam demands that Bo-na go back to being who she used to be.
Bo-na wonders — does she mean go back to who she was before she had a family?
If you want revenge on me, she thinks, you could simply kill me — and Bo-na, unable to grasp Hyun-nam’s true intent, is thrown into confusion. Then suddenly she recalls a fleeting memory of glimpsing Hyun-nam as a child, and without hesitation drinks the entire cup containing the Myst poison.
Caught off guard by this unexpected act, Hyun-nam is now the one thrown into confusion, while Bo-na looks at her and confirms that she was indeed that same little girl from back then.
In the past, young Hyun-nam lived with a monstrous father. Watching his daughter grow up, one day he entered Hyun-nam’s room for the first time, and when her mother tried to stop him, he brutally killed her. But the monster was sentenced to a mere 7 years in prison.
For those seven years, Hyun-nam desperately searched for a way to ensure he could never return to the world, but with only the power of a young girl, she could find no answer, and even after seven years passed, she was still a minor. On the Christmas Day he was released, the monster even bought her a present, putting on a show of remorse and kindness.
For a moment, seeing this, Hyun-nam almost forgave her father — but by chance her eyes fell on the gift bag, inside of which were cable ties, box tape, and rope. Just as an icy terror washed over her, her father lunged at her and began strangling her, as punishment for having reported him seven years earlier.
Writhing in agony and losing consciousness, Hyun-nam made one final plea — that if God existed, please save her. At that very moment, as if by miracle, something pierced through the monster’s temple, and he collapsed. Through the gap in the window where the bullet had come from, far in the distance, someone stood on the rooftop of a high-rise building, holding something long.
When Hyun-nam ran outside, the figure waved and disappeared, and in front of her snow-covered house, the handwritten words “Merry Christmas” were left behind. Weeping tears of joy, Hyun-nam came to firmly believe that the person who saved her was God.
Afterward, she taught herself everything she needed and desperately searched for that person, and at last, the god she found had become the mother and wife of an ordinary family. Devastated and shocked to discover that the god she believed in had become such an ordinary, fragile woman, Hyun-nam decided to eliminate everything that made Bo-na weak — including her family — in order to turn her back into the Kingfisher of the past.
Back in the present, Hyun-nam, flustered by what she has done, doesn’t know what to do. Bo-na calmly says she remembers that Hyun-nam was that little girl, then declares that if her husband isn’t given the antidote, she too will die. Hyun-nam, enraged, asks if family is really worth risking one’s life over, but Bo-na answers that she isn’t risking her life for her family — her family is her life itself.
And then, this time, Bo-na collapses into Hyun-nam’s arms, pleading with her to save her instead…
With a bitter, tearful expression, Hyun-nam confesses: “You are my god. There’s no way I could really kill you. That wasn’t poison — it was just a sleeping pill.” The situation is resolved, and when Tae-seong wakes from his deep sleep with no idea what happened, he smiles brightly as he heads home together with Bo-na.
Bo-na returns to her ordinary, precious daily life, spending happy time with her family — until the arrival of the one ancestral rite day per year at her in-laws’ house.
Every year, Yoo Bo-na endures a harsh time listening to harsh words from her mother-in-law. Seon-ja disapproves of Bo-na over everything, simply because she is an orphan who grew up without parents, and even blames Bo-na for the fact that she gave birth to a granddaughter, Yuri, rather than a grandson to carry on the family line.
This year’s ancestral rite is no exception, and conflict erupts once again…
Tae-seong, having come home early from work and feeling for his struggling wife, helps her cook — and is caught red-handed by Seon-ja. Seon-ja, born into a wealthy Seoul family but married into a provincial head family as a daughter-in-law, endured many sorrowful years until she finally felt her life turn around after giving birth to her precious son Tae-seong, and she treasures him as if he were her own life.
Seeing her precious son doing the dishes instead of his wife, because he married an orphan, sends her into a blind rage. Tae-seong tries to explain that Bo-na’s hand was injured, but her anger does not subside, and finally, unable to bear it any longer, Tae-seong declares that they will no longer hold the ancestral rite and takes Bo-na and leaves the house.
At that very moment, Tae-seong’s younger sister Se-a, who had taken her niece Yuri to the playground because of the family fight, comes running back, pale as a ghost, delivering the shocking news that Yuri has disappeared. The whole family rushes outside and searches everywhere, even reporting it to the police, but they cannot find any trace of the child.
Amid the chaos, Seon-ja tells Se-a not to run around in a panic and to go back inside and wait, and even the normally patient Bo-na’s eyes turn cold at these harsh words. Pulling herself together, Bo-na spots security cameras nearby and immediately calls genius hacker Young-do for help.
Young-do uses a clue from a conversation Se-a had with Yuri right before she disappeared: Yuri had asked why her mother’s parents don’t hold ancestral rites, and how one goes about meeting someone who has died. Using this as a clue, and inferring from the fact that Yuri had been staring blankly up at an airplane, Young-do suspects the rooftop.
Bo-na rushes to the rooftop and finally finds Yuri. Scolding her through tears of relief and resentment, she breaks down crying when Yuri explains she was worried she wouldn’t be invited to the ancestral rite, so she went to invite the dead herself. Bo-na holds the child in her arms, swallowing her tears.
After much back-and-forth, the situation is finally resolved and the family returns home, where Tae-seong argues that, given what just happened, they should abolish the ancestral rite entirely. Seon-ja refuses to the end and declares they should settle it by vote. Though Seon-ja stubbornly resists to the very last, she reluctantly attends, and Bo-na, watching from afar, briefly wonders whether the dead really do return.
The vote result is surprisingly unanimous, making this the family’s last ancestral rite…
Meanwhile, Detective Lee Dong-jin redoubles his investigation to catch Kingfisher. He discovers a peculiar pattern in which criminals are punished anywhere from a few days to as much as a year after release — but that child sex offenders in particular never survive even a single day after release, vanishing without a trace.
Meanwhile, Pyo Gyu-cheol, the worst child sex offender to have ever shocked the nation, is finally released from prison. The scene is packed with protesters against his release and reporters. As Pyo Gyu-cheol emerges under plainclothes police escort, someone claiming to be an acquaintance of a fellow inmate secretly approaches and hands him a note instructing him to use supplies prepared in the second stall of the restroom at a highway rest stop.
Stopping at the rest stop, Pyo Gyu-cheol follows the instructions, changing his clothes, hat, mask, and glasses, and slips away undetected, getting into a waiting car in the parking lot. Believing it to be help from his acquaintance, he feels reassured — but the ones who picked him up were Durumi Electronics employees. Arriving late to the rest stop, Dong-jin is stunned to find that Pyo Gyu-cheol has vanished without a trace.
Taken to a secluded villa, Pyo Gyu-cheol brazenly claims he only wanted to meet his victims and apologize, but this only further inflames the anger of the Durumi Electronics employees. Waiting for him in the holding room is torture specialist Yang Ye-sol.
Born with a condition that prevents her from feeling pain, torture was a natural calling for Ye-sol, and she found true happiness living an ordinary life as a kindergarten teacher, caring for children. Then one day, a child who was fond of her fell victim to a sex offender, and for the first time in her life, she felt an agonizing pain deep in her chest.
From that day on, Ye-sol joined Durumi Electronics and began her dark work, and at her hands, Pyo Gyu-cheol pays for his crimes and vanishes from the world forever.
Around this time, Tae-seong, who has also been independently investigating released criminals, discovers that dozens of sex offenders he had been monitoring have lost contact, and he is seized by deep suspicion.
Meanwhile, since Young-do hasn’t been contacting her, Se-a arranges her own date under the pretext of returning some clothes as an excuse to create an opportunity to see him. She plans a date course and drags Bo-na along to a PC gaming café that Bo-na enjoys. There, Se-a’s longtime friend, the passionate police officer Beom Seong-hoon, joins them.
Seong-hoon, with his indomitable competitiveness and naive sense of justice, is a reliable partner in Dong-jin’s operation to track down Kingfisher. Casually joining as Se-a’s friend, he starts a game and is stunned by Bo-na’s incredible skill playing the sniper position.
Watching Bo-na’s overwhelming performance, Seong-hoon becomes convinced she must be “Sergei,” the gaming genius legend who disappeared from a training room years ago. Se-a makes a bet with Seong-hoon, wishing that if she wins, she’ll get to see Young-do, but Bo-na deliberately shows an opening and loses to Seong-hoon.
Both Se-a and Seong-hoon vaguely sense that Bo-na lost on purpose…
Seong-hoon says goodbye to Bo-na, telling her it was an honor to meet her, and leaves. Se-a, using the bet as an opportunity, asks Bo-na — who had always spoken formally to her — to drop the honorifics, and the two grow closer. Meanwhile, that night, Seong-hoon recalls something Se-a said right before the bet — that she had someone she liked and wanted him to win for her sake — and mistakenly believes she meant him.
Yoo Bo-na is assigned a new mission and goes on a business trip with Young-do. The target is Tak Jong-gu, the son of a politician, who drugged and assaulted sleeping women and distributed the videos, but who was released on probation thanks to his father’s enormous influence in hiring lawyers.
On his father’s orders, Tak Jong-gu is essentially confined to a casino hotel, never going outside…
For this operation, Young-do develops probability-calculating glasses to win money at blackjack and head up to the VIP room upstairs. The plan is to secretly slip Tak Jong-gu a potion that triggers an allergic reaction, then have a waiting colleague disguise as an on-call doctor and pretend to transfer him to a hospital — at which point, as they leave the hotel, Bo-na would take the shot.
But Young-do loses at blackjack and someone else wins the VIP invitation, throwing the plan into disarray, so Bo-na ends up infiltrating the hotel herself and sneaking into Tak Jong-gu’s room. There, she discovers that the woman who won the invitation has already eliminated Tak Jong-gu, and a fight breaks out between her and Bo-na.
It turns out that two different teams’ operations had overlapped, and the real target was Chairman Cheon Seong-gil of a construction company staying on the same floor of the same building. Chairman Cheon was a monstrous man who forced his hired housekeepers, employees, and even his own wife to sign sexual-slavery contracts, and had eliminated the husband who reported him by disguising his death as an accident.
The team that came to eliminate Chairman Cheon consisted of Mun Da-rae and Mun Meoru, who work as ordinary mechanics by day. Their plan was to lure Tak Jong-gu as a patsy, go up to the VIP floor on the 29th floor, have Mun Meoru knock him out disguised as room service, and start a fire to create chaos, using it as cover to eliminate Chairman Cheon.
While Bo-na’s group and Mun Da-rae’s group notice each other and get into a fight, they nearly run into Tae-seong, who had come up to the 29th floor to report on Chairman Cheon, but they avoid the crisis thanks to Young-do’s camera support. When Mun Meoru tries to eliminate Chairman Cheon, Bo-na blocks her and another fight breaks out — but just then, team leader Kim Bong-pal rushes in to stop the out-of-control Bo-na, and the misunderstanding is cleared up.
The next day, Se-a, who came on the business trip with Tae-seong to dig up dirt on Chairman Cheon’s corruption, hides a fountain-pen-shaped spy camera in the VIP corridor and falls asleep while staking out from the emergency stairwell. Woken by commotion in the hallway, Se-a witnesses Chairman Cheon’s body being carried out, and checking the recorded footage, she sees Tak Jong-gu entering Chairman Cheon’s room and reports this to Tae-seong.
But this was actually a collaboration between the two teams, orchestrated by the storyteller Mun Meoru!
They had provoked a fight between Tak Jong-gu and Chairman Cheon, who were gambling together, then had Mun Meoru knock out Tak Jong-gu and move him into the already-dead Chairman Cheon’s room, while Young-do manipulated the hotel’s surveillance cameras. Afterward, it was made to look as though Tak Jong-gu jumped from the terrace window and died, and the incident was reported as the result of a fight between the two men.
Meanwhile, Tae-seong shares drinks with Dong-jin and talks about Kingfisher. Dong-jin brings up the story of a young child who, four years earlier during the Haesong Boarding House murder case, watched his father get shot right beside him, and who suffered such trauma that he developed a speech disorder, arguing that private retribution can never be permitted.
Drunk, Tae-seong whispers into Dong-jin’s ear that he knows who Kingfisher is, then falls asleep…
The next day, when Dong-jin visits Tae-seong’s home and asks about what he said, Tae-seong explains that while reporting near the Haesong Boarding House in the past, he witnessed a tall, well-built, blond-haired male sniper. At that very moment, at the airport, Bo-na waves and calls out the name “Seul-gi” toward that very blond man Tae-seong described.
Four years earlier…
After marriage, Bo-na continued her missions, and just as she was about to snipe a target at the Haesong-dong boarding house, she discovered she was pregnant. Yong-bae, a colleague at the time, suggested hiring the mercenary Sergei in Bo-na’s place — and that mercenary was Seul-gi. Meanwhile, Tae-seong happened to accompany a colleague who was pursuing special rape offender Yeon Chang-bok, ending up unexpectedly at the scene.
When Yeon Chang-bok’s mother arrives in front of the boarding house building, drops off only her grandson, and leaves, Tae-seong finds this suspicious and, while checking the surrounding buildings, climbs up to a construction site rooftop. Bo-na, preparing to take her shot, turns around at the sound of the door opening, but Sergei and Yong-bae, who had followed him up, strike Tae-seong on the back of the head, knock him out, and lock him in the trunk of a car.
Meanwhile, when the target’s son arrives, they decide to resume the operation after he leaves — but Sergei impulsively shoots the target while the child is still right beside him. Enraged, Bo-na beats Sergei down and lashes out at him, and when Sergei belatedly learns from Yong-bae that Bo-na is pregnant, he decides to make up for his mistake by gifting a doll that resembles a baby — and that doll turns out to be the very one Yuri treasures.
Sergei takes Tae-seong, still trapped in the trunk, to a secluded mountain road, checks photos of him and Bo-na together, and warns him to keep everything he saw that day a secret before giving him an injection and releasing him. Returning home, Tae-seong is met by Bo-na holding out an ultrasound photo, and he weeps, saying how glad he is to be able to return to her side.
Sergei, the mercenary who had been staying in his hometown in Russia, returns to Korea and is welcomed by his colleagues at Durumi Electronics. Sensitive about cleanliness, he claims he saw a shocking exposé video about a Korean hotel where a cup was wiped with the same rag used to clean the toilet, so he can no longer trust Korean hotels and says he’ll be relying on the staff for lodging…
But wherever he stays, he grows increasingly agitated by the lack of cleanliness and grows visibly thinner, eventually turning to Bo-na for help. Meanwhile, Tae-seong, who already knew that Bo-na’s close friend Seul-gi was a man, feels a pang of jealousy upon seeing that he is far more handsome than expected — and watching this, the bond between the married couple grows even warmer.
While Bo-na finds Tae-seong’s jealousy endearing and peaceful time passes, Seul-gi bids farewell with a casual “good night,” and Tae-seong freezes on the spot. He suddenly recalls the voice of the sniper who, four years earlier, blindfolded him, locked him in the trunk, and stuck him with a needle, and he is plagued by nightmares that night.
Having slept poorly, Tae-seong heads to work, leaving behind Seul-gi, who casually greets him good morning as if nothing happened. Seeing Tae-seong’s haggard face, a close colleague jokingly asks if he needs a referral to a private investigation agency, and though Tae-seong laughs it off at first, thinking of Seul-gi, he later seriously requests the referral with a grave expression.
Some time later, the report on Sergei Romanovich Volkonsky, delivered by the investigation agency’s client, is astonishing. The Volkonsky family is a prominent local family, so renowned for their noblesse oblige that there’s a saying that there are no beggars on their estate — always helping those in need and even running a children’s welfare scholarship foundation, an utterly impeccable family.
Tae-seong reluctantly buries his uneasy feelings…
At that moment, Kingfisher finishes preparing for her first mission in a long while. This time, the client and target is Jang Eun-hak, the true culprit behind the Gangmyeon-dong supermarket murders — a case from 20 years earlier in which a middle-aged couple was killed after he broke into their neighborhood store, and who was released on parole a year early without serving his full 16-year sentence. Coincidentally, Tae-seong, also investigating a mission Kingfisher might target, learns of Jang Eun-hak’s parole.
Fifteen years ago, when Dong-jin and Tae-seong were high school students, they ignored their mothers’ calls and spent the day happily playing at a PC gaming café before finally heading home. But the moment they opened the door of their neighborhood store, the two boys froze at the sight of their parents lying dead and cold on the floor. Jang Eun-hak, now being released on parole, was the very man who had killed the parents of Tae-seong’s close friend, Detective Lee Dong-jin.
To check how Jang Eun-hak is living, Dong-jin heads with Tae-seong to the Chinese restaurant where he reportedly works. Having heard he had been properly rehabilitated, they go to see with their own eyes whether he has really changed. At the restaurant, Jang Eun-hak, bowing his head obsequiously to the owner while delivering food, at first glance seems like nothing more than a frail old man, and the two, feeling a sense of emptiness, are about to turn back.
But as Jang Eun-hak passes by, Dong-jin sharply catches the curse he mutters under his breath toward the owner and the chilling look in his eyes. When Tae-seong fails to notice, Dong-jin sends him ahead and stays behind to keep watching…
With a weary expression, Jang Eun-hak stops by a store and buys something, then heads back toward the very Chinese restaurant that had fired him. What he pulls out of the bag is none other than a kitchen knife. As Jang Eun-hak charges at the restaurant owner with the knife, Dong-jin immediately blocks him with a gas gun and issues a warning. But at the sight of the gas gun, Jang Eun-hak’s eyes go wild, and he swings the knife at Dong-jin, wounding him, before fleeing.
Coming to his senses, Dong-jin chases him to a dead end and aims his gun, ordering him to stop. Face to face with his parents’ murderer, countless complicated thoughts race through his mind. As he struggles to decide how to act, a sniper’s bullet flies in from somewhere and pierces Jang Eun-hak’s temple.
While Dong-jin was still hesitating, judgment had already been passed on the man who, fifteen years earlier, escaped a murder conviction and was found guilty only of manslaughter due to his excuses and claims of diminished capacity from drunkenness.
Though he had wanted this enemy torn apart with a hatred beyond words, when he finally had his gun aimed at him face to face, Dong-jin could not bring himself to pull the trigger — and in the blink of an eye, the man was killed by a sniper’s bullet instead. When Tae-seong, arriving belatedly, comes to support the bleeding Dong-jin, Dong-jin looks up at the rooftop, mutters the name “Kingfisher,” and repeats over and over, like someone in a daze, that he absolutely must catch Kingfisher.
Once he regains his composure, Dong-jin confides to Tae-seong that he is determined to catch the Kingfisher who stole his revenge. He declares that if the man hadn’t been rehabilitated, he himself would have captured and rehabilitated him again and again if necessary, and that he can never accept Kingfisher unilaterally destroying the rules that their society has built.
Now that the embargo has lifted, following Dong-jin’s remark that there’s no longer any need to hide it, Tae-seong publishes a story about Kingfisher’s return, and the media erupts. As debate rages across every corner of society over Kingfisher, the sniper who metes out judgment, the police form a dedicated Kingfisher murder investigation task force led by Lee Dong-jin.
Meanwhile, while gossiping with the neighborhood women, Seon-ja laments that Bo-na, being an orphan without parents, never even had a proper meeting between the two families before marriage — and just as she’s saying this, she runs into Tae-seong and Bo-na, who happen to visit the chicken restaurant, once again souring the mood. Tae-seong is enraged anew at his mother’s attitude, and Seon-ja too feels uneasy, when Seul-gi declares an emergency: Mama has arrived from Russia…
The lady of the Volkonsky family, Maria Aleksandrovna Volkonskaya, is Seul-gi’s biological mother and Bo-na’s adoptive mother.
Though Seul-gi and Bo-na are not blood-related, they are legally bound as siblings, and without any notice, Maria arrives at Seon-ja’s chicken shop and sets down a mountain of gift packages. Overwhelmed by the imposing Maria and her bodyguards, Seon-ja is completely awestruck, and her usual dismissive attitude toward Bo-na instantly vanishes.
Meanwhile, upon hearing that Maria has come to Korea, Tae-seong goes searching for her but freezes when he finds his adoptive mother-in-law at his own mother’s shop. Facing Bo-na calmly, Maria declares that she has come to Korea to personally take her back with her.
At that moment, the Kingfisher task force begins to notice the criminal’s peculiar pattern of movements.
How Bo-na and Tae-seong First Met
In June, eight years earlier, Seoul was ablaze with excitement over the 2002 World Cup. Amid the chaotic atmosphere, Tae-seong was covering a rampant pickpocketing case. Victims testified that they smelled a faint, mysterious scent right before their wallets were stolen, and Tae-seong, also covering the story, noticed the same faint scent as his own wallet was stolen, and desperately began chasing the fleeing culprit.
But as he chased the pickpocket, who fled up the stairs of a nearby tower building, Tae-seong was struck on the head from a blind spot by a baseball bat the culprit swung, and collapsed on the spot. At that very moment, Bo-na, having just sniped her client and coming down from the rooftop of the tower building, discovers Tae-seong collapsed on the stairs.
She gives him a light shake to try to wake him, but he remains unconscious. Bo-na uses Tae-seong’s phone to report that someone has collapsed, and as she descends the stairs, thinks to herself that the man was quite handsome. That day, Bo-na had, in effect, saved a life on her way back from taking one.
From that day on, Bo-na felt an intense sense of disillusionment and no longer wanted to continue this line of work, seriously considering quitting and pausing her missions for a while. Feeling an emptiness as though her heart had been hollowed out, Bo-na one day stands precariously at the edge of a hospital rooftop railing, lost deep in thought.
At that moment, a hospital patient passing below spots her and shouts for her to come down immediately, warning that it’s dangerous — and looking closely, it turns out to be the very same man she had encountered on the stairs before. As Tae-seong desperately argues for the value of life, trying to talk her down, Bo-na calmly climbs down from the railing and casually says she wasn’t trying to kill herself.
Tae-seong studies her closely and, tilting his head, says he feels like they’ve met somewhere before. Bo-na, judging that if this man discovers her identity, a situation might arise where she has to eliminate him, requests a background check on him from headquarters.
The background check Young-do runs at headquarters reveals that Tae-seong is an ordinary reporter, currently hospitalized after injuring his head while reporting a few months earlier, and that although he has a deep interest in Kingfisher, he maintains a thoroughly neutral stance, neither hating nor idolizing the figure.
Since he’s an unpredictable person, Bo-na decides to keep a discreet eye on him, and while looking for a chance to speak to him on the hospital rooftop where he’s staying, she runs into Tae-seong again. But this time Tae-seong has a girlfriend on his arm, and the moment he sees Bo-na, he approaches her, insisting he’s certain he’s seen her somewhere before, asking about everything from her hometown to any possible connection since elementary school — but Bo-na answers no to everything.
Shortly after, when Tae-seong’s girlfriend approaches warily, Bo-na leaves, but feels a strange, inexplicable irritation rising within her.
Meanwhile, worn out from having paused her work, Bo-na is advised by Young-do to take a trip, and he happens to recommend the very mountain lodge where Tae-seong is staying. In the snowy winter mountain lodge, Tae-seong and Bo-na unexpectedly cross paths again.
Tae-seong tries to be friendly, and though Bo-na coldly ignores him, he doesn’t give up, continuing to approach and try to get closer to her. She had only wanted to spend quiet time alone doing nothing, resting — but the lodge owner couple, due to catch a cold, are unable to arrive as planned the next day because of an unprecedented heavy snowfall, leaving Bo-na and Tae-seong suddenly alone together.
As they work together on everything from meal preparation to survival, Tae-seong senses a peculiar duality in Bo-na. Despite having no apparent will to live or ambition for life, she displays survival skills in extreme situations unlike anyone he’s ever seen. Caught up in his own misunderstanding, Tae-seong single-handedly decides to instill hope and enthusiasm for life in Bo-na, throwing himself into the effort with excessive enthusiasm. Watching his ridiculous antics, Bo-na, once so cold, slowly begins to open her heart…
But the peace doesn’t last — that night, rats in the food storage knock over a stove, causing a fire that turns most of their food supplies to ash. To make matters worse, even the communication lines are cut, leaving the lodge in complete, extreme isolation. Mistakenly believing Bo-na came to the lodge to make an extreme choice out of despair over life, Tae-seong, worried she might do something drastic, deliberately keeps up pointless jokes and idle chatter about everyday things.
When he takes his eyes off her for a moment and discovers that Bo-na has vanished along with a gun, he panics, thinking she’s about to make an extreme choice, and rushes into the mountains to find her. Chasing the sound of gunfire and tripping over something, Tae-seong comes face to face with Bo-na, who has just returned from hunting.
Coming to his senses, Tae-seong looks around, and the moment he sees Bo-na, he rushes over and throws himself into her arms, bursting into tears like a child. Watching him sob, saying he thought she had left this world and was terrified, Bo-na finds herself unconsciously patting his back warmly, and after that incident, the two grow dramatically closer.
When Tae-seong tells her small stories about his family, Bo-na finds herself strangely interested and listens intently. One morning, after falling asleep in the same spot together due to the cold, Tae-seong leads Bo-na somewhere and shows her a place with a beautiful snowy view, sincerely confessing his love to her.
Bo-na asks why he’s doing this when he doesn’t even really know who she is…
Tae-seong confesses that even with just the small part of her that he’s come to know among her many facets, he has truly fallen in love with her. At those words, Bo-na finally opens the door to her heart, and that night, with a passionate kiss, they become a couple. Though isolated at the lodge, the two spend a happy time together and envision a future as an ordinary couple.
A few days later, having come down from the lodge and returned to daily life, Bo-na finally finds the true meaning she wants to live for, withdraws her resignation, and returns to the company. From then on, the two continue dating happily, sharing all the experiences they’ve always wanted to try together. Then one day, Tae-seong sincerely proposes to Bo-na, calling it the lifelong wish he has always wanted most, and Bo-na happily accepts.
The Identity of Kingfisher
Back in the present, Maria sharply presses Bo-na to stop all this and return to Russia. Enraged, Bo-na instantly subdues Maria’s bodyguards and, without hesitation, points a gun at Maria’s head and pulls the trigger. Fortunately it’s an empty gun with no bullets, but seeing Bo-na’s firm resolve, Maria, with a relaxed smile, remarks on how splendidly Bo-na has grown up, and lets her go.
But inwardly, Maria leaves behind a meaningful warning that Bo-na will eventually return to them.
Meanwhile, Lee Dong-jin, analyzing two decisive gaps in Kingfisher’s activity, notices a chilling common thread. In both incidents, Tae-seong had been near the scene, and Dong-jin begins to harbor deep suspicion over whether this is truly just a coincidence. That night, over drinks, Dong-jin asks Tae-seong point-blank whether he himself might be Kingfisher, but Tae-seong is baffled…
Dong-jin points out the two gaps in activity and the coincidence of Tae-seong being present each time, and raises the possibility that the anonymous caller who once reported Tae-seong’s collapse using his own phone might have been Kingfisher herself. Tae-seong laughs it off in disbelief, asking whether Kingfisher would really have saved his life with her own hands.
Around that time, Seong-hoon, after running around everywhere, dramatically manages to track down the contact information of the dispatch center employee who took the 112 emergency call eight years earlier. Too much time has passed to obtain the actual recording, but he makes the tremendous discovery that the caller was confirmed to be a woman.
Building on this, Dong-jin determines that the tower building across from the City Square attack site eight years earlier had 28 floors total, and that Tae-seong was found collapsed on the 12th-floor stairwell. The estimated time of the sniper attack on the victim inside City Square Hotel and the time Tae-seong was found differed by a mere 7 minutes.
In other words, he concludes that Kingfisher, having just carried out the crime on the rooftop, was descending via the stairs when she discovered Tae-seong collapsed there — and that the caller was a woman. But there was a fatal contradiction in this seemingly perfect hypothesis: the Kingfisher that Tae-seong himself testified to having witnessed with his own eyes during the Haesong-dong boarding house incident was unmistakably a blond man.
Because of this contradiction, Dong-jin is once again blocked by a massive wall of confusion. While he begins to suspect that Kingfisher may not be a single individual but an organized group operating together, he cannot shake the conviction that the symbolic sniper must be one and the same person, and he can’t find his footing.
Frustrated, Dong-jin begins to thoroughly comb back through past records left behind by his predecessors on the task force.
Eight years earlier, when the streets and all of Seoul were ablaze with World Cup fever, the owner of the tower building had locked and closed off the building entirely to prevent the crowds of cheering fans from illegally using the first-floor restroom. Strangely, though, someone had unlocked all the doors on the first floor of the building, and the internal CCTV that day was completely dead. Records show that the building manager at the time stated he hadn’t even realized the CCTV was broken, since it appeared to be functioning normally.
To uncover the truth, Dong-jin heads to the prison to visit the pickpocket who assaulted Tae-seong that day…
The pickpocket recalls seeing someone else inside the tower hotel besides Tae-seong at the time, and testifies that he saw a woman wearing red flame-themed cheering squad attire inside the building. Dong-jin becomes fully convinced that Kingfisher was, without a doubt, a woman.
That night, Dong-jin and Seong-hoon are invited to Tae-seong’s home for dinner and spend a warm, cheerful evening together. As young Yuri warmly takes to Dong-jin like a real uncle and everyone enjoys a pleasant time, Seong-hoon, who happened to stop by the bathroom, brings up something strange he noticed — baby powder.
It matched the traces of baby powder that had recently been found during forensic examination of a crime scene linked to Kingfisher. It’s a common item in any household raising children, but since the product had since been discontinued, it wasn’t something one could easily obtain unless they had stocked up on it beforehand.
As the conversation about baby powder continues lightly, Dong-jin suddenly recalls his own theory that Kingfisher must be a woman, and abruptly falls silent. He also gives Seong-hoon a suspicious look, warning him to be careful with what he says going forward. On the way home, Dong-jin can’t understand himself why he suddenly stopped talking in front of Tae-seong, but he can’t shake an inexplicable sense of foreboding.
Afterward, Dong-jin decides to once again pursue the whereabouts of Pyo Gyu-cheol, who most recently gave his parole officers the slip and vanished without a trace. According to police systems, Pyo Gyu-cheol’s biometric signals are sporadically appearing across the country, so officials cannot officially declare him dead — but Dong-jin is certain this is unmistakably Kingfisher’s doing.
Determined to reset the investigation from square one and thoroughly dig into Kingfisher and the organization behind them, Dong-jin forms a hypothesis that Kingfisher is not a lone criminal but an organically operating group of accomplices. This is supported by the fact that witnesses have described Kingfisher’s appearance inconsistently — sometimes as a woman, sometimes as a man, sometimes as a foreigner. Carefully re-investigating cases with similar patterns of punishment, Dong-jin becomes deeply focused on a man named Gu Jong-yeol, who went missing shortly after his release.
This is because evidence emerged suggesting that Gu Jong-yeol had been alone at home with his young daughter right up until he disappeared shortly after his release. For reference, it was Bo-na and Hyun-nam who had punished Gu Jong-yeol. When the two of them went to eliminate him, they only belatedly discovered that a young daughter was living there with him. Hyun-nam had considered using Myst to erase the child’s memories, but stopped herself when she saw her own unfortunate childhood reflected in the girl.
When Hyun-nam told the girl that her “unnie” would get rid of the monster, and to nod twice if she wanted that, the girl quietly nodded — and just as Bo-na had once had her own monster eliminated in the past, the two of them successfully took Gu Jong-yeol away. Trusting the child, Hyun-nam decided not to use Myst on her, but partway through the operation, she was startled to find the child had disappeared and ran outside — only to find the girl pointing to a hidden surveillance camera up in a tree in the yard.
The girl hadn’t run away — she had secretly warned the two of them about the hidden camera in advance, and thanks to this, they were able to complete their mission perfectly without leaving any trace. Hyun-nam gave the child a small dose of a sedative, then left behind only a small gift coated with a four-leaf clover, a symbol of good luck, before leaving.
To meet the only witness to this case — Gu Jong-yeol’s daughter — Dong-jin and Seong-hoon head to the orphanage. But the girl, who has a hearing impairment, remains silent, seemingly unable to hear their questions, simply fidgeting endlessly with a paper four-leaf clover origami piece in her hands.
Just then, shocking and unexpected news reaches the Kingfisher task force. Song Hye-sun, a former orphanage director just a week away from completing her full prison term, sends the task force a desperate letter pleading for help. Rushing to the prison to visit her, Dong-jin finds Song Hye-sun trembling in terror, sobbing that Kingfisher will surely come to punish her.
Out in the world, a massive fan club idolizing Kingfisher had already sprung up everywhere. On platforms like YouTube and other online spaces, countless people were glorifying Kingfisher as a hero. Among vicious criminals — especially the shameless perpetrators of child sex crimes — rumors that Kingfisher would inevitably come to deliver judgment had quietly spread as an accepted, terrifying fact.
Song Hye-sun, the former orphanage director now on the brink of release, hears a chilling prophecy from a fellow inmate who used to be a shaman, that Kingfisher will come to punish her, and gripped by extreme terror, urgently requests police help. Lee Dong-jin strongly argues that they should thoroughly protect and monitor Song Hye-sun and set up a sting operation, but team leader Gu Tae-seok opposes this, citing a lack of concrete evidence.
But behind this lay a truth that could not be spoken…
The team leader’s son, Gu Seong-min, had been the victim of the so-called Bong-i-dong Rose Shooting incident 14 years earlier, and the team leader was convinced that Kingfisher was the very person who had killed his son, and he had been desperate to catch Kingfisher with his own hands, one way or another.
To persuade the team leader, Dong-jin begins digging into the hidden side of Song Hye-sun, and finally uncovers the shocking truth that children from the orphanage she ran had been deliberately involved in staged traffic accidents, as clear victims of intentional insurance fraud.
Song Hye-sun had, in fact, accumulated enormous wealth through this horrific insurance fraud scheme. Moved by his subordinate’s passion and the solid evidence before him, team leader Gu ultimately stakes his entire police career to convince his superiors, securing approval from higher-ranking authorities, and launches a dangerous sting operation to catch Song Hye-sun.
Meanwhile, inside Durumi Electronics, an intense operation planning meeting is also underway to eliminate this target, Song Hye-sun. Song Hye-sun, planning to liquidate all her assets upon release and follow her wife and son, who had already emigrated to the Philippines, out of the country, intends to first return to the old orphanage in Gapyeong to settle remaining real estate she still owns domestically.
Durumi Electronics seizes on exactly this, perfectly disguising themselves as real estate agents, hacking the messenger app of Song Hye-sun’s wife to send her a fake message claiming that a property deed is hidden inside the safe at the long-closed old orphanage, luring her to the orphanage as the final meeting location to finish her off completely.
Once again, Bo-na and Hyun-nam are deployed for this operation…
On the day of the meeting, as Bo-na follows Song Hye-sun and enters the orphanage, she is suddenly seized by overwhelming panic in an unexpected moment. A deeply buried, dark trauma button from her past has been mercilessly pressed. To Bo-na, who grew up not even knowing her parents’ faces and believed the orphanage was her entire world, the director had appeared kind on the surface but was in truth a vicious human being.
Every night, he would call children in, feed them candy laced with sleep-inducing substances, commit acts of abuse, then sell the photographs to adoptive parents like merchandise — a truly demonic man. One day, when the orphanage’s pet rabbits were killed by feral dogs, Bo-na, determined to punish the dogs, got a slingshot from a friend and practiced shooting at them meticulously every single day, aiming carefully.
Maria, who had come as a sponsor at the time, watched Bo-na closely and gave her the cold advice never to eat the candy, and that in a real fight, one must aim precisely for the eyes. A week later, the director, as always, called Bo-na in and tried to force the candy on her. Desperately fleeing, Bo-na hid in a darkroom next to the director’s office, where she discovered photographs of the abhorrent crimes he had been committing against the children.
As Bo-na fled in horror, the director chased after her — and remembering Maria’s advice, Bo-na aimed the slingshot and struck the director’s eye precisely. Maria, who appeared at just that moment, grabbed Bo-na’s hand, and the two disappeared into the darkness, leaving the burning orphanage behind them. As those horrific memories come flooding back, tormenting her, Bo-na barely manages to snap out of it at the sound of her colleagues’ urgent warnings and resumes pursuing Song Hye-sun.
At that very moment, Lee Dong-jin and Seong-hoon, having sharply pinpointed the location, storm the scene. Sensing that the situation is a perfect trap, Bo-na instantly turns and begins to flee, with Seong-hoon fiercely giving chase. Dong-jin tries to secure Song Hye-sun safely and move her to a police car, but receives shocking news from task force headquarters that the road has been completely blocked by a rockslide, making it impossible to access the scene.
Meanwhile, blinded by greed, determined to retrieve the secret funds hidden in the safe no matter what, Song Hye-sun alone rushes into the director’s office — and the moment she opens the safe, she witnesses a rat that leaps out, carrying a USB drive containing a critical secret, and flees. Consumed with fury, Song Hye-sun madly chases the rat through the pitch-black mountain paths and thick forest, finally reaching the edge of a great cliff, her eyes gleaming as she rushes toward the USB lying on the ground.
At that very moment, a police car from the task force, having finally broken through the rockslide-blocked road and racing wildly through the area, bursts out — and Song Hye-sun is struck by the car and killed instantly on the spot. The mission ends in this pointless, tragic way, and the news that Song Hye-sun died in a traffic accident during a police sting operation is instantly and extensively reported across national media.
The public and press, completely unaware of the horrific evil Song Hye-sun had committed, begin to fiercely condemn the police for having driven an ordinary released citizen to his death through a reckless sting operation. Facing unbearable public pressure, police leadership ultimately dismisses most of the task force’s personnel en masse, effectively disbanding the team.
Shortly after, the team members are scattered to their separate posts, and Dong-jin and Seong-hoon are practically demoted, reassigned to a local precinct. The only small consolation is that, belatedly, an internal police investigation exposes Song Hye-sun’s horrific crimes to the world in full.
Original Webtoon “A Bona Fide Killer” Ending
After the case concludes, Dong-jin mulls over how, during the sting operation, every movement and piece of information seemed to fit perfectly into the enemy’s hands, as though laid out on a palm, and comes to believe there must be an internal spy. It turns out that Durumi Electronics already knew, as clearly as reading the back of their hand, that the police had formed a dedicated task force to catch Kingfisher — and had planted a bribed collaborator not only within the police but deep inside the prison system itself.
The true final goal of this operation was never simply to punish a criminal — it was to permanently dismantle the very police task force pursuing Kingfisher. Team leader Gu Tae-seok, who had been leading the police organization, had himself become the spy who led the team to its own dissolution.
Visiting his son’s memorial alone, team leader Gu weeps, recalling the memory of his son Gu Seong-min, who had jumped from a rooftop, unable to bear the horrific bullying he suffered from school violence perpetrators. Though his son died after suffering hellish torment at the hands of his abusers, when those abusers escaped proper legal punishment on the grounds of being minors, team leader Gu, in his despair, met a figure known only as “H” online and, pleading for his grievance to be resolved, handed over all the confidential information related to his son.
As time passed, the day team leader Gu watched that abuser, now an adult, get brutally punished by Kingfisher, he began to see Kingfisher as his sole savior and agent of revenge, and has been loyal ever since. Kingfisher’s reach had already infiltrated deep into every corner of the world, even into the front lines of the law itself — the police force.
Meanwhile, Se-a continues a precarious tug-of-war in a love triangle between her detective friend Seong-hoon and the dangerous genius hacker Young-do. Being with Young-do gives her an electrifying rush of dopamine and intense excitement, but conversely, the comfort and joy she feels with Seong-hoon also plunges her mind into deep contemplation.
Then one day, having grown somewhat closer to Young-do, Se-a is invited to and visits his home, where she witnesses with her own eyes an unimaginable number of weapons caches and secret facilities related to crime, and is thrown into a massive shock. At that moment, Young-do hands Se-a a small vial containing a blue liquid, telling her that if she drinks it, all her memories from the past hour will be completely erased, and she’ll be able to return to living peacefully with him as before — giving her the choice.
But he coldly informs her that if she chooses not to drink it, she must be prepared to fully accept this entire truth and act according to her own will. After much agonizing, Se-a swallows the blue pill herself, but every time she wakes up, the memory of the previous hour is completely erased, causing her severe confusion.
The fateful day.
Young-do confesses to Se-a that he isn’t merely an employee, but the core member who perfectly supports Kingfisher from behind the scenes, and once again offers her the blue vial, asking what choice she will make this time. But this time, Se-a refuses and chooses to part ways with Young-do forever.
The two thus part in heartbreak, and amid the pain of separation, Se-a gradually begins to form a concrete picture of who Kingfisher’s true identity might be. The one person in the world who could perfectly support Young-do’s secretive and dangerous work at the closest possible distance was one single person — Yoo Bo-na.
Thinking back, she recalls how Bo-na, who was supposedly just an ordinary housewife, had shocked Se-a on multiple occasions with an overwhelming, almost monstrous physical prowess. In the past, when Seon-ja was nearly scammed out of her entire fortune by a voice-phishing gang, Bo-na, together with Se-a, had chased down the perpetrators and instantly subdued them with overwhelming force, punishing them decisively.
Recalling the sharp, cold killing intent and tense aura that occasionally radiated from Bo-na’s eyes, all the puzzling fragments Se-a had encountered until now finally come together into a single, complete truth. The cruel yet righteous judge that no one in the world could have ever imagined — the true identity of Kingfisher — was none other than her own sister-in-law, Yoo Bo-na.
kdrama A Bona Fide Killer
- Korean: 유부녀 킬러 / Japanese: 人妻キラー
- Genre: Thriller, Drama, Action
- Number of Episodes: 14 episodes
- Release Date: July 31, 2026
- Original Work: The same-titled webtoon “A Bona Fide Killer” by author YOON, Geomdung (original work)
- Broadcast Time: Fridays, Saturdays at 9:50 PM
- Director: Yoon Jong-ho, Kim Ji-hoon
- Screenplay: Writer Kim Eun-hee (writer of the drama “Golden Spoon”)
- Cast: Gong Hyo-jin, Jung Jun-won, Lee Sang-yi, Sung Dong-il, and others
- Music: Park Seong-il
- Filming Period: December 2025 –
- Production Company: Bon Factory, Barunson Pictures, Studio Fim
- Streaming: Wavve, Coupang Play
- Rating: 15+
- OTT: Wavve, Coupang Play (South Korea)
- Network: MBC TV
